Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

Quartz (Pale Rose or Milky Variety)

Silicon Dioxide (SiO2)

Ironstone Concretion (Moqui Marble Type)

Goethite/Hematite-cemented Sandstone Concretion

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone with Brachiopods

Calcium Carbonate (CaCO3) with fossilized Brachiopoda sp. (likely Order Spiriferida or Rhynchonellida)

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Pyrite (on Shale/Matrix)

Iron Disulfide (FeS2)

Sandstone (River Cobble)

Clastic Sedimentary Rock (primarily Quartz with Feldspar)

Agate (translucent pebble)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Sandstone

Arenite (primarily SiO2)

Chert (Flint)

Chert (SiO2)

Bauxite

Bauxite (mainly Al(OH)3, AlO(OH))

Quartz

Quartz (SiO2)

Chert (Field Flint)

Microcrystalline Quartz (SiO2)

Chert (specifically a flint nodule component)

Microcrystalline quartz (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) in Geode form

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Agate and Amethyst (Quartz variants)

Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Oolitic Chert

Silicon Dioxide (SiO2) with oolitic texture

Mookaite Jasper

Silicified Porcellanite (SiO2 with impurities)

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Quartz (Gravel fragment)

Quartz (Silicon Dioxide, SiO2)

Iron Meteorite

Iron-nickel alloy (primarily kamacite and taenite)

Agate (specifically, a slice of a Blue Lace or Chalcedony Agate nodule)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Hematite Nodules (Moqui Marbles style)

Iron Oxide (Fe2O3)

Jasper with Quartz vein

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Smoky Quartz (with possible Feldspar inclusions)

Silicon Dioxide (SiO2)

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Red Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)

Bauxite

Bauxite (Principal ore of aluminum; mixture of minerals including Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)